I am sorry for you guys who are a hard stick! I used to be very hard to stick when I was younger, and somehow "grew" veins, thank god!
I do totally agree with the above poster! Some people just don't know where to look for veins. They are used to sticking in the AC, the back of the hand, and that's it! You can't always see them, you should be able to find them just by feeling them, too, have a basic idea of where they SHOULD be if you can't feel them, and sometimes get a transilluminator out and look THROUGH the hand in the dark. I've stuck people in the oddest places, but they don't mind that they have an IV in their breast, or up near their shoulder, or on their thumb, or the top of their foot, if I get it on the first try, instead of someone else making a pincushion of them ten times.
I pride myself on being a "good sticker" and often have to run up to the other floors in the hospital to start IV's or draw blood. I have a lot of frequent fliers that if I find a good vein in an out of the way stop, I tell them to "save that vein for ME! It's mine and don't let anyone else stick it and ruin it!"